Spontaneous fission ( SF ) is a form of radioactive decay that is found only in very heavy chemical elements.

Spontaneous fission has never been observed in the naturally-occurring isotopes of these elements, however.

Spontaneous fission is feasible over practical observation times only for atomic masses of 232 a. m. u.

Spontaneous fissions release neutrons as all fissions do, so if a critical mass is present, a spontaneous fission can initiate a self-sustaining chain reaction.

Spontaneous fission rates:

* Spontaneous fission

Spontaneous fission ends up with a probabilistic distribution of daughter products, which sets it apart from cluster decay.

In an 1870 address titled, " Spontaneous Generation ", Thomas Henry Huxley defined biogenesis as life originating from other life and coined the negative of the term, abiogenesis, which was the term that became dominant.

: Spontaneous song became a marked characteristic of the camp meetings.

For their first album with Columbia, they enlisted Pete Seeger as backup banjo player for the live album A Spontaneous Performance Recording It included songs that would soon become classics, such as " Brennan on the Moor ," " Jug of Punch ," " Reilly's Daughter ," " Finnegan's Wake ," " Haul Away Joe ," " Roddy McCorley ," " Portlairge " and " Moonshiner.

Spontaneous breathing is resumed after the end of the duration of action of curare, which is generally between 30 minutes and eight hours, depending on the variant of the toxin and dosage.

Spontaneous remission has been known to occur, and in cases where anxiety is thought to be a major contributor, symptoms are typically lessened after the underlying anxiety is treated.

Spontaneous lactation occasionally occurs in starving men ; after World War II, for example, thousands of cases were observed among POWs released from concentration camps.

Spontaneous Recovery in MFR supports the claim of competition since after a rest period participants spontaneously remembered original pair associations that they were not able to remember right after the second test.

Spontaneous breathing is resumed after the end of the duration of action of curare, which is generally between 30 minutes to 8 hours, depending on the variant of the toxin and dosage.

It takes place on a starship of the same name which has undergone " Spontaneous Massive Existence Failure " ( S. M. E. F ) and crash landed on Earth on its maiden voyage ( in an allusion to the 1912 disaster involving the real-world RMS Titanic ).

Spontaneous remission, also called spontaneous healing or spontaneous regression, is an unexpected improvement or cure from a disease that appears to be progressing in its severity.

The Ojibwe scholar, linguist and author Basil Johnston, who explains the name in a creationist context, states that its literal translation is " Beings Made Out of Nothing ", or " Spontaneous Beings ", since they had been created by divine breath and were made up of flesh and blood and a soul or spirit-instead of rock, or fire, or water, or wind.

* Spontaneous symmetry breaking where the laws are invariant but the system is not because the background of the system, its vacuum, is non-invariant.

Doug Pratt, a DVD reviewer and Rolling Stone contributor, gave " Spontaneous Combustion " a negative review ; he called it " pretty dopey " and said " Sure, it's funny if you like passing gas jokes, but its aspirations are limited.

* John Stevens ( drummer ) ( 1940 – 1994 ), English drummer and founding member of the Spontaneous Music Ensemble

Spontaneous mutations on the molecular level can be caused by:

Spontaneous activity in the primary sensory areas may produce hallucinations which are misinterpreted by the secondary areas as information from the real world.

* Spontaneous Combustion ( album ), a 2007 album by Liquid Trio Experiment

* Spontaneous Combustion ( film ), a 1990 film by Tobe Hooper

Spontaneous emission is the process by which a light source such as an atom, molecule, nanocrystal or nucleus in an excited state undergoes a transition to a state with a lower energy, e. g., the ground state and emits a photon.

Spontaneous emission of light or luminescence is a fundamental process that plays an essential role in many phenomena in nature and forms the basis of many applications, such as fluorescent tubes, older television screens ( cathode ray tubes ), plasma display panels, lasers ( for startup-normal continuous operation works by stimulated emission instead ) and light emitting diodes.

Spontaneous premature ovarian failure affects 1 % of women by age 40, and 0. 1 % of women by age 30.

The Spontaneous Music Ensemble was formed by John Stevens and Trevor Watts in the mid-1960s and included, at various times, influential players such as Derek Bailey, Evan Parker, Kenny Wheeler, Roger Smith, and John Butcher.

The Spontaneous Music Ensemble ( SME ) was a loose collection of free improvising musicians convened beginning in the mid-1960s by the late South London-based jazz drummer / trumpeter John Stevens and alto and soprano saxophonist Trevor Watts.

* Spontaneous emergence of elementary particles out of the vacuum, as explained by quantum theory, and the equally spontaneous decay of single particles and the mutual annihilation of particles and anti-particles,

* Spontaneous potential, a measurement taken by oil industry well loggers to characterise rock formation properties

Inspired by a thousand-word rambling letter from his friend Neal Cassady, Kerouac in 1950 outlined the " Essentials of Spontaneous Prose " and decided to tell the story of his years on the road with Cassady as if writing a letter to a friend in a form that reflected the improvisational fluidity of jazz.

* Triad ( album ), 1976 album by Spontaneous Combustion

Spontaneous orders are distinguished by being scale-free networks, while organizations are hierarchical networks.

* The Tradition of Spontaneous Order, by Norman Barry, Library of Economics and Liberty

Ferrin's Spontaneous Inventions, directed by Bud Schaetzle, is an hour-long recording of a 1986 performance in Hollywood.

* Performances by the school's improvisation troupe, Spontaneous Generation, and sketch comedy troupe, Nitrous Oxide, and of contemporary musical theater, Cabaret Troupe, in concert style.

* The Spontaneous Expansion of the Church and the Causes which Hinder it., Cambridge: Lutterworth Press, 2006, ISBN 978-0-7188-9171-8 ; foreword by Bishop Michael Turnbull.

* Spontaneous Healing by Andrew Weil

; Spontaneous recovery from extinction and recovery from extinction caused by reminder treatments ( reinstatement )

Spontaneous tōge battles may also be initiated by random encounters between racers on the street.

Finn departed and was replaced for a short period by Paul Entwhistle, also of Liverpool band, Spontaneous Cattle Combustion.

Spontaneous demonstrations broke out in Luxor almost immediately against the terrorists, demanding action by the government and leading to a visit by Mubarak to the region a few days later.